Visit — Each player draws a card from the library of the player to their right. You create three Treasure tokens.

: Add . This land deals 1 damage to you.
Threshold — , , Sacrifice this land: Target player draws three cards, then discards three cards. Activate only if there are seven or more cards in your graveyard.

Medium Fiend (devil), Challenge 8
Armor class 16, Hit Points 85
Speed 30 ft.
Attacks Chain, Animate Chains, Unnerving Mask
STR 18 (+4) DEX 15 (+2) CON 18 (+4)
INT 11 (+0) WIS 12 (+1) CHA 14 (+2)

When you set this scheme in motion, for each opponent, exile target permanent that player controls. Then each player reveals cards from the top of their library until they reveal a permanent card, puts it onto the battlefield, and puts the rest on the bottom of their library in a random order.

When you encounter Chaotic Aether, each blank roll of the planar die is a roll until a player planeswalks away from a plane. (Then planeswalk away from this phenomenon.)

Huge construct, Challenge 11
Armor class 17, Hit Points 147
Speed 30 ft., fly 90 ft.
Attacks Claw, Tail, Wings, Malevolent Presence, Radiant Breath
STR 27 (+7) DEX 11 (+0) CON 19 (+4)
INT 10 (+0) WIS 10 (+0) CHA 3 (-4)

This land enters tapped unless you control a legendary creature.
: Add . When you next cast a Bird creature spell this turn, it enters with an additional +1/+1 counter on it.
, : Create a 2/2 green Bird creature token with "Whenever a land you control enters, this token gets +1/+0 until end of turn."

As this land enters, you may reveal an Island or Swamp card from your hand. If you don't, this land enters tapped.
: Add or .

When you set this scheme in motion, target opponent chooses a player. Until your next turn, only you and the chosen player can cast spells and attack with creatures.

When you set this scheme in motion, look at the top four cards of your library and separate them into a face-down pile and a face-up pile. An opponent chooses one of those piles. Put the cards in that pile into your hand and the rest on the bottom of your library in any order.

Ninjas the bosses control get +1/+0 for each boss in play.